东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2008, Vol. 29 ›› Issue (8): 1118-1121.DOI: -

• 论著 • 上一篇    下一篇

Al-6.5Zn-2.4Mg-2.3Cu铝合金半连续铸锭的均匀化处理

高凤华;田妮;孙兆霞;赵刚;   

  1. 东北大学材料各向异性与织构教育部重点实验室;东北轻合金有限责任公司科研所;
  • 收稿日期:2013-06-22 修回日期:2013-06-22 出版日期:2008-08-15 发布日期:2013-06-22
  • 通讯作者: Gao, F.-H.
  • 作者简介:-
  • 基金资助:
    国家高技术研究发展计划项目(2003AA331100)

Homogenization treatment of semicontinuous casting ingot of Al-6.5Zn-2.4Mg-2.3Cu aluminum alloy

Gao, Feng-Hua (1); Tian, Ni (1); Sun, Zhao-Xia (2); Zhao, Gang (1)   

  1. (1) Key Laboratory for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110004, China; (2) Research Center, Northeast Light Alloy Co. Ltd., Harbin 150060, China
  • Received:2013-06-22 Revised:2013-06-22 Online:2008-08-15 Published:2013-06-22
  • Contact: Gao, F.-H.
  • About author:-
  • Supported by:
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摘要： 采用DSC、金相、扫描电镜及能谱分析等方法,研究了Al-6.5Zn-2.4Mg-2.3Cu超高强铝合金半连续铸锭的结晶相及其在470℃均匀化处理过程中的变化规律.结果表明:在均匀化处理过程中,铸锭中含有Al,Zn,Mg,Cu元素的非平衡凝固共晶体在向合金基体溶解的同时还转变形成S相(Al2CuMg),形成的S相在该合金中的熔化温度为490℃;均匀化处理初期,含有Al,Zn,Mg,Cu的非平衡凝固共晶体转变成S相的速度大于S相向合金基体溶解的速度,导致S相数量随均匀化处理时间的延长,先增加随后减少到平衡值,但不能全部溶入合金基体.

关键词: 超高强铝合金, 半连续铸锭, 均匀化处理, 非平衡凝固共晶体

Abstract: The constituents in the semicontinuous casting ingot of the super-high strength Al-6.5Zn-2.4Mg-2.3Cu aluminum alloy and how they change in the process of homogenization treatment at 470°C were studied by differential scanning calorimetry (DSC), optical microscopy (OM) and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX). The results showed that non-equilibrium freezing eutectic containing Al, Zn, Mg, Cu in the ingot not only dissolves into the alloy matrix, but also transforms into S phase (Al2CuMg) in the homogenization treatment process, and the S phase thus formed melts at 490°C in this alloy. During the initial period of the process, the formation rate of S phase is higher than the rate of S phase's dissolution into the alloy matrix, thus resulting in that the quantity of S phase increases at first then decreases to equilibrium value with the prolonged time for homogenization. However, the S phase in the alloy can not be dissolved into its matrix completely.

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